Is there a feature that will allow me to customize such elements as fonts in text fields, button styles, etc.?Yes. The feature is called StyleBuilder, which allows you to make new versions of style files such as buttons, check boxes, ratings, and text fields. You can access this option by selecting Edit > StyleBuilder... from the menu bar. In the StyleBuilder dialog, you can then unpack a current style, modify it as needed, and repack it for use within your Viewlet authoring application.

This is an advanced tool and may not be for everyone. If you are interested in finding out more and watch a tutorial on working with the StyleBuilder tool, click here.